摘要
以稀土铁硼废料湿法回收稀土工艺过程废水预处理产出的硫化物渣为研究对象,因其含有一定量的钴、镍、铜、稀土等高值有价元素,为避免资源的浪费,本研究对硫化物渣进行深度处理回收其中有价元素。研究结果表明,硫化物渣先进行水洗以降低渣中可溶盐含量从而减少对后期各元素萃取分离过程的不利影响,水洗渣通过控制反应温度、反应时间、氧化剂加入量等条件进行酸溶,酸溶液中的有价元素通过萃取分离的方式回收。最后酸溶渣采用三级逆流酸洗涤的方式进行处理,将有价元素充分回收,最终渣中的稀土以硫酸稀土复盐形式存在。整体工艺中,硫化物渣中钴、镍、铜实现高效回收,稀土以微观结构规则、尺寸相近的硫酸稀土复盐晶体形式存在。
The research object is the sulfide residue produced during the wet recovery of rare earth iron boron waste in the process of wastewater pretreatment. In order to avoid wasting resource, this paper studies the deep treatment of the sulfide residue to recover valuable elements. The research results indicate that sulfide residue is first washed with water to reduce the soluble salt content and thereby reduce the adverse effects on the later extraction and separation process. The washed residue is dissolved with acid by controlling reaction temperature, reaction time and the amount of oxidant added. Valuable elements in the acid solution are recovered through extraction and separation. Finally, the acid soluble residue is treated by using a three-stage countercurrent acid washing method to fully recover valuable elements, and the rare earth in the final residue exists in the form of sulfate complex salt. In the overall process, cobalt, nickel and copper in sulfide residue are efficiently recovered, and rare earths exist in the form of similar sized sulfate complex salt crystals with regular microstructure.
作者
李俊林
崔建国
王新宇
侯睿恩
郝先库
徐萌
张升强
孙书鹏
高斌人
LI Jun-lin;CUI Jian-guo;WANG Xin-yu;HOU Rui-en;HAO Xian-ku;XU Meng;ZHANG Sheng-qiang;SUN Shu-peng;GAO Bin-ren(National Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization,Baotou Research Institute of Rare Earths,Baotou 014030,China;China Northern Rare Earth(Group)High-Tech Co.,Ltd.,Baotou 014010,China;China North Rare Earth Smelting Branch(Huamei Company),Baotou 014010,China)
出处
《稀土》
CSCD
北大核心
2023年第6期64-71,I0004,共9页
Chinese Rare Earths
关键词
稀土铁硼废料
硫化物渣
有价元素回收
硫酸稀土复盐
逆流酸洗涤
rare earth iron boron waste
sulide residue
valuable elements recovery
rare earth sulfate double salt
countercurrent acid washing
